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E. P. MONROE. CALENDAR CLOCK.

No.16,628. Patented Feb. 10, 1857.

UNITED STATES PATENT OFFICE.

EDIVIN P. MONROE, OF ALBANY, NEIV YORK, ASSIGNOR TO GILBERT H. SGRIBNER, OF NEW YORK, N. Y.

CALENDAR-CLOCK.

Specification of Letters Patent No. 16,628, dated February 10, 1857.

To all whom it may concern:

Be it known that I, EDWIN P. MONROE, of the city of Albany and State of New York, have invented a new and useful machine to be used as an attachment to the common hour-clock or to be operated by any other appropriate machinery for the purpose of keeping and showing the day of the month; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1 is afront view and Fig. 2 a side elevation thereof.

Letter A in Fig. 1 represents a cog wheel surrounding and firmly attached to the pinion on stud upon which rests the hour hand in the common time clock. Letter B represents another cog wheel containing ex actly twice as many cogs as wheel A and works into and is drix'en by the same.

Letter C is a small connecting rod connecting the crank pin upon wheel B with the hand marked D which is movable in the slides E, E, and which is situated directly above the intervening space between the front card 7 and the remainder of the pack consisting of thirty one cards numbered with large figures from 1 upward as the days of the month occur. These cards are suspended upon a wire the end of which is shown at F.

hen the clock is correctly set and in motion the hour hand pinion or stud by two revolutions in other words once in twentyfour hours causes one revolution of the wheel B and thus by means of the connecting rod O depresses the hand D to its lowest point in the slides E, E, which in descending passes behind the front card 7 and displaces the same from the wire F thereby exposing to view the next card 8 and thus each twenty-four hours exhibits to view the next succeeding day of the month.

Letter G represents the end view of a wire loop or staple passing through all the cards and upon which the same are sus pended after they have been displaced by the hand D as above described and have fallen over in front.

In Fig. 2 letter A represents a side view of the same loop or staple with a portion of the cards B suspended thereon.

O represents a side view of the wire upon which the cards D are suspended before the same are displaced which last mentioned wire is surrounded and wound with a spiral spring E which presses the cards forward as fast as the same are displaced and have fallen over in front. F represents one of two small side springs alike in construction and position placed into grooves in the wire C which are to prevent the cards from falling off while the hand is at its highest point as represented in this figure and which springs are pressed into said grooves by the two forks of the hand I as shown at H, H, in Fig. 1 as they descend closely behind the front card with said forks upon either side of the said wire C in Fig. 2. Letter H shows the wedge like form of each of said forks of the hand I by means of which the front card is pressed forward and off the wire O in the descent of said hand. G rep resents a metallic bar into which the said looped wire or staple and the wire O in Fig. 2 are firmly riveted and by means of which the whole is attached to the under part of the clock or other machinery by which the same is to be operated.

In constructing and attaching this machine to the common clock I first place the slides E, E, in Fig. 1, firmly into a groove prepared for their reception in the front part of the bottom board of the case surrounding the clock movement. I then by means of the metallic bar G in Fig. 2 attach the cards, and staple and wire upon which the same are suspended to the under side of the clock case sufficiently back from the front of the same so that the hand D in Fig. 1 when placed in the slides E, E, also attached to the clock case as hereinbefore described will be directly above the intervening space between the front and second card as suspended upon the wire O in Fig. 2. Then by adjusting the connecting rod O in Fig. 1 as hereinbefore described the whole is ready for operation. I put metallic eyelets in the tops and bottoms of all the cards for the double purpose of causing Them to move easily on the wires upon which they are suspended and also thereby producing wider spaces between the cards for the entrance of the hand which is to displace the same,

In using this machine as an attachment to the common hour clock care should be taken to so place the hour hand upon its pinion or stud as that when the same is pointing to the figure 12 at noon that the hand D shall be ator nearly at its highest point as in Fig. 1and When thus arranged one revolution of the said pinion or stud Will bring the said hand to its lowest point thus displacing the front card at or about the hour of midnight. Upon the first day of each month I place all of the cards upon the upper wire C in Fig. 2 and nothing further is necessary than that the clock to Which the Whole is attached should be arranged or set as aforesaid and keep correct 

